1 | /*
|
---|
2 | * get_pathname.c --- do directry/inode -> name translation
|
---|
3 | *
|
---|
4 | * Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
|
---|
5 | *
|
---|
6 | * %Begin-Header%
|
---|
7 | * This file may be redistributed under the terms of the GNU Public
|
---|
8 | * License.
|
---|
9 | * %End-Header%
|
---|
10 | *
|
---|
11 | * ext2fs_get_pathname(fs, dir, ino, name)
|
---|
12 | *
|
---|
13 | * This function translates takes two inode numbers into a
|
---|
14 | * string, placing the result in <name>. <dir> is the containing
|
---|
15 | * directory inode, and <ino> is the inode number itself. If
|
---|
16 | * <ino> is zero, then ext2fs_get_pathname will return pathname
|
---|
17 | * of the the directory <dir>.
|
---|
18 | *
|
---|
19 | */
|
---|
20 |
|
---|
21 | #include <stdio.h>
|
---|
22 | #include <string.h>
|
---|
23 | #if HAVE_UNISTD_H
|
---|
24 | #include <unistd.h>
|
---|
25 | #endif
|
---|
26 |
|
---|
27 | #include "ext2_fs.h"
|
---|
28 | #include "ext2fs.h"
|
---|
29 |
|
---|
30 | struct get_pathname_struct {
|
---|
31 | ext2_ino_t search_ino;
|
---|
32 | ext2_ino_t parent;
|
---|
33 | char *name;
|
---|
34 | errcode_t errcode;
|
---|
35 | };
|
---|
36 |
|
---|
37 | #ifdef __TURBOC__
|
---|
38 | # pragma argsused
|
---|
39 | #endif
|
---|
40 | static int get_pathname_proc(struct ext2_dir_entry *dirent,
|
---|
41 | int offset EXT2FS_ATTR((unused)),
|
---|
42 | int blocksize EXT2FS_ATTR((unused)),
|
---|
43 | char *buf EXT2FS_ATTR((unused)),
|
---|
44 | void *priv_data)
|
---|
45 | {
|
---|
46 | struct get_pathname_struct *gp;
|
---|
47 | errcode_t retval;
|
---|
48 |
|
---|
49 | gp = (struct get_pathname_struct *) priv_data;
|
---|
50 |
|
---|
51 | if (((dirent->name_len & 0xFF) == 2) &&
|
---|
52 | !strncmp(dirent->name, "..", 2))
|
---|
53 | gp->parent = dirent->inode;
|
---|
54 | if (dirent->inode == gp->search_ino) {
|
---|
55 | retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1,
|
---|
56 | &gp->name);
|
---|
57 | if (retval) {
|
---|
58 | gp->errcode = retval;
|
---|
59 | return DIRENT_ABORT;
|
---|
60 | }
|
---|
61 | strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF));
|
---|
62 | gp->name[dirent->name_len & 0xFF] = '\0';
|
---|
63 | return DIRENT_ABORT;
|
---|
64 | }
|
---|
65 | return 0;
|
---|
66 | }
|
---|
67 |
|
---|
68 | static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir,
|
---|
69 | ext2_ino_t ino, int maxdepth,
|
---|
70 | char *buf, char **name)
|
---|
71 | {
|
---|
72 | struct get_pathname_struct gp;
|
---|
73 | char *parent_name, *ret;
|
---|
74 | errcode_t retval;
|
---|
75 |
|
---|
76 | if (dir == ino) {
|
---|
77 | retval = ext2fs_get_mem(2, name);
|
---|
78 | if (retval)
|
---|
79 | return retval;
|
---|
80 | strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
|
---|
81 | return 0;
|
---|
82 | }
|
---|
83 |
|
---|
84 | if (!dir || (maxdepth < 0)) {
|
---|
85 | retval = ext2fs_get_mem(4, name);
|
---|
86 | if (retval)
|
---|
87 | return retval;
|
---|
88 | strcpy(*name, "...");
|
---|
89 | return 0;
|
---|
90 | }
|
---|
91 |
|
---|
92 | gp.search_ino = ino;
|
---|
93 | gp.parent = 0;
|
---|
94 | gp.name = 0;
|
---|
95 | gp.errcode = 0;
|
---|
96 |
|
---|
97 | retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
|
---|
98 | if (retval)
|
---|
99 | goto cleanup;
|
---|
100 | if (gp.errcode) {
|
---|
101 | retval = gp.errcode;
|
---|
102 | goto cleanup;
|
---|
103 | }
|
---|
104 |
|
---|
105 | retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
|
---|
106 | buf, &parent_name);
|
---|
107 | if (retval)
|
---|
108 | goto cleanup;
|
---|
109 | if (!ino) {
|
---|
110 | *name = parent_name;
|
---|
111 | return 0;
|
---|
112 | }
|
---|
113 |
|
---|
114 | if (gp.name)
|
---|
115 | retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
|
---|
116 | &ret);
|
---|
117 | else
|
---|
118 | retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
|
---|
119 | if (retval)
|
---|
120 | goto cleanup;
|
---|
121 |
|
---|
122 | ret[0] = 0;
|
---|
123 | if (parent_name[1])
|
---|
124 | strcat(ret, parent_name);
|
---|
125 | strcat(ret, "/");
|
---|
126 | if (gp.name)
|
---|
127 | strcat(ret, gp.name);
|
---|
128 | else
|
---|
129 | strcat(ret, "???");
|
---|
130 | *name = ret;
|
---|
131 | ext2fs_free_mem(&parent_name);
|
---|
132 | retval = 0;
|
---|
133 |
|
---|
134 | cleanup:
|
---|
135 | ext2fs_free_mem(&gp.name);
|
---|
136 | return retval;
|
---|
137 | }
|
---|
138 |
|
---|
139 | errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino,
|
---|
140 | char **name)
|
---|
141 | {
|
---|
142 | char *buf;
|
---|
143 | errcode_t retval;
|
---|
144 |
|
---|
145 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
---|
146 |
|
---|
147 | retval = ext2fs_get_mem(fs->blocksize, &buf);
|
---|
148 | if (retval)
|
---|
149 | return retval;
|
---|
150 | if (dir == ino)
|
---|
151 | ino = 0;
|
---|
152 | retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
|
---|
153 | ext2fs_free_mem(&buf);
|
---|
154 | return retval;
|
---|
155 |
|
---|
156 | }
|
---|